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The lucky chancer pretended to be a part of Floyd Mayweather’s security team, tagging along as they walked past security – and it worked.

The Kings Head employee claims staff failed to scan his ticket and he was able to walk in before plonking himself down on the third row during the undercard, next to some of the biggest celebrity names in the world.

“I did feel a bit cheeky but this was an once-in-a-lifetime chance,” he told The Sun . “I could not believe it worked.

“There were quite a few empty seats.

“I sat down in the third row and Mike Tyson then sat down behind me. LeBron James was on my row and I could see Leonardo DiCaprio.”

As the crowd filled ahead of the show-down, the McGregor super-fan - who has a tattoo of his idol on his right leg - got cold feet about staying in the seat and instead started fraternising with the A-list names who had turned out for the event.

Among those to have a selfie with Mr Regis were P Diddy, Mike Tyson, US pop singer Demi Lovato, Jamie Foxx and Floyd Mayweather’s dad, Floyd Mayweather Sr.

Eventually, the boxing fanatic took up a seat further back in the tenth row, next to former Premier League footballer-turned actor, Vinnie Jones.

He too agreed to a photo, and together the pair watched as McGregor - competing in his debut boxing bout - lasted ten rounds with Mayweather before the fight was eventually stopped.

That result means that Mayweather now has a record of 50 wins without ever tasting defeat in his professional career.

And while Mr Regis was disappointed to see his hero lose, he insists he will be happy upon his return to the UK.